sippy cup recommendation

[mjo1]

I am using Avent sippy cups, but have found they do leak a bit. Has anyone else experienced this? Any do you have any recommendations for a non-leaky cup?

Mjo

I bought a really cheap one from Asda when DS was about 10 months old - it's fab and definitely never leaks. He still uses it now and he is 2.9 (he won't part with it!)